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python course ppt (introduction)

Python is a widely used computer programming language. It is often used for web development, automating tasks, and data analysis. It is generally regarded as an easy-to-learn language for beginners. SCODE NETWORK is an excellent online portal for Python training at an affordable price.

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python course ppt (introduction)

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  1. Python www.scodenetwork.com Contact no.-9990211148, 9990211149

  2. What is Python ? Python is a general purpose, dynamic, high level and interpreted programming language. It supports Object Oriented programming approach to develop applications. Python supports multiple programming pattern, including object oriented, imperative and functional or procedural programming styles. Python is not intended to work on special area such as web programming. That is why it is known as multipurpose because it can be used with web, enterprise, 3D CAD etc. We don't need to use data types to declare variable because it is dynamically typed so we can write a=10 to assign an integer value in an integer variable. Python makes the development and debugging fast because there is no compilation step included in python development and edit-test-debug cycle is very fast.

  3. www.scodenetwork.com Contact no.-9990211148, 9990211149

  4. Compiler Vs Interpreter Compiler Interpreter Scans the entire program and translates it as a whole into machine code. Translates program one statement at a time. It takes large amount of time to analyze the source code but the overall execution time is comparatively faster. It takes less amount of time to analyze the source code but the overall execution time is slower. Generates intermediate object code which further requires linking, hence requires more memory. No intermediate object code is generated, hence are memory efficient. It generates the error message only after scanning the whole program. Hence debugging is comparatively hard. Continues translating the program until the first error is met, in which case it stops. Hence debugging is easy. www.scodenetwork.com Contact no.-9990211148, 9990211149

  5. Python History • The implementation of Python was started in the December 1989 by Guido Van Rossumat CWI in Netherland. • In February 1991, van Rossum published the code (labeled version 0.9.0) to alt. sources. • In 1994, Python 1.0 was released with new features like: lambda, map, filter, and reduce. • Python 2.0 added new features like: list comprehensions, garbage collection system. • On December 3, 2008, Python 3.0 (also called "Py3K") was released. It was designed to rectify fundamental flaw of the language. ABC language & Modula-3 www.scodenetwork.com Contact no.-9990211148, 9990211149

  6. Python Features • Easy to Learn and Use • Expressive Language • Interpreted Language • Cross-platform Language • Free and Open Source • Object-Oriented Language • GUI Programming Support • Large Standard Library www.scodenetwork.com Contact no.-9990211148, 9990211149

  7. • • Flavors of Python: 1.CPython: It is the standard flavor of Python. It can be used to work with C lanugageApplications Dynamically Typed Embedded 2. Jythonor JPython: It is for Java Applications. It can run on JVM 3. IronPython: It is for C#.Netplatform 4.PyPy: The main advantage of PyPyis performance will be improved because JIT compiler is available inside PVM. 5.RubyPython For Ruby Platforms 6. AnacondaPythonIt is specially designed for handling large volume of data processing.

  8. Python Applications • Web Applications • Desktop GUI Applications • Software Development • Scientific and Numeric • Business Applications • Console Based Application • Audio or Video based Applications • 3D CAD Applications • Applications for Images • Enterprise Applications

  9. Python Versions Python Version Python 1.0 Released Date January 1994 Python 1.5 December 31, 1997 Python 1.6 September 5, 2000 Python 2.0 October 16, 2000 Python 2.1 April 17, 2001 Python 2.2 December 21, 2001 Python 2.3 July 29, 2003 Python 2.4 November 30, 2004 Python 2.5 September 19, 2006 Python 2.6 October 1, 2008 Python 2.7 July 3, 2010 Python 3.0 December 3, 2008 Python 3.1 June 27, 2009 Python 3.2 February 20, 2011 Python 3.3 Python 3.4 September 29, 2012 March 16, 2014 Python 3.5 September 13, 2015 Python 3.6 December 23, 2016 Python 3.6.4 December 19, 2017

  10. Python 2.X vs3.X Error Handling Division operator Print Function Xrange

  11. Python Identifiers A Python identifier is a name used to identify a variable, function, class, module, or other object. An identifier starts with a letter A to Z or a to z, or an underscore (_) followed by zero or more letters, underscores and digits (0 to 9). Python does not allow punctuation characters such as @, $, and % within identifiers. Python is a case sensitive programming language. Thus, Car and car are two different identifiers in Python. Here are naming conventions for Python identifiers: •Class names start with an uppercase letter. All other identifiers start with a lowercase letter. •Starting an identifier with a single leading underscore indicates that the identifier is private. •Starting an identifier with two leading underscores indicates a strongly private identifier. • If the identifier also ends with two trailing underscores, the identifier is a language-defined special name.

  12. Identifiers 1. The only allowed characters in Python are :=== • alphabet symbols(either lower case or upper case) • digits(0 to 9) • underscore symbol(_) 2. By mistake if we are using any other symbol like $ then we will get syntax error. cash = 10 ca$h=20 3. Identifier should not starts with digit 123total total123 4.Identifiers are case sensitive. Of course Python language is case sensitive language.  total=10 TOTAL=999  print(total) #10  print(TOTAL) #999 Identifier: 1. Alphabet Symbols (Either Upper case OR Lower case) 2. If Identifier is start with Underscore (_) then it indicates it is private. 3. Identifier should not start with Digits. 4. Identifiers are case sensitive. 5. We cannot use reserved words as identifiers Eg: def=10 6. There is no length limit for Python identifiers. But not recommended to use too lengthy identifiers. 7. Dollor($) Symbol is not allowed in Python.

  13. Keywords in Python Program: Output:

  14. Lines and Indentation Python provides no braces to indicate blocks of code for class and function definitions or flow control. Blocks of code are denoted by line indentation, which is rigidly enforced. Multi-line statements Statements in Python typically end with a new line. Python does, however, allow the use of the line continuation character (\) to denote that the line should continue. For example:

  15. Quotation in Python Python accepts single ('), double (") and triple (''' or """) quotes to denote string literals, as long as the same type of quote starts and ends the string. Triple quotes are also used for multiple line comments

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